Wiring a Receptacle for a Lift Pump for a Septic System

Wiring a Lift Pump Circuit Works for a Septic System: How a Float Switch Works for Turning On a Septic Pump.

Septic System Lift Pump and the Float Switch

Electrical Question: I recently re-wired a receptacle for the lift pump for my septic system.

The previous home owner had buried the cable under ground and the over the years the cable deteriorated and corroded and eventually shorted out.

I took the old wire out from the electrical panel and installed new wire in weather tight conduit and a new GFI plug in the receptacle box.

I have a Greenlee gt-11 circuit tester and it shows that I have power to the receptacle, but when I plug in the lift pump and the float switch, they don’t work. I also have a lighted circuit tester that when plugged into the GFI receptacle, shows that I have an open hot wire.

I went back and checked all my connections and they are all properly connected and tight. I always thought that open hot meant there was a direct short in the wire, but the circuit breaker is not tripping.

I’m stumped. Could you explain to me the meaning of open hot, and maybe give me some clues as how to solve this dilemma.
Thank you for your time.

This electrical troubleshooting question came from: Matt, from Nederland, Colorado.

Dave’s Reply:
Thanks for your electrical wiring question Matt.

How a Lift Pump Circuit Works

What is an Open Hot

An open hot means that there is no voltage on the black wire of the circuit at the location of the device that is being served by the circuit.

GFCI Power Source

If the GFI plug has power, but you are testing a cord that is attached to the float then it is possible that the motor may be kept from running if it is not submerged into water to protect it from damage.

How a Float Switch Works

A float is basically is a switch, where the power comes in one wire, goes through a pair of contacts, and then travels back out through another wire.

When the switch is open, which is the same as being off, this condition creates one example of an open hot.

When the switch contacts are closed this creates a completed circuit which then flows electrical power to the device that it is controlling, which in this case is a sump pump.

Electrical Circuit Wiring

GFCI and GFI Wiring Diagrams

The features and benefits of GFCI outlets and receptacles will give you a clear understanding of the importance why these safety devices are required by code to help protect you and your family against accidental electrical shock hazards.

GFCI Wiring
This list of articles will help you learn about the features and benefits provided by GFI and GFCI Receptacles and how they are wired.

Understanding Electrical Testers

When working on home electrical wiring using voltage testers can play an important part in electrical safety. Electrical testers enable you to identify electrical circuits and help prevent the possibility of accidental electrical shock.

Learn How to Wire it Right with myComplete Guide to Home Electrical WiringPerfect for Homeowners, Students,Handyman, Handywomen, and ElectriciansIncludes:Wiring GFCI OutletsWiring Home Electrical Circuits120 Volt and 240 Volt Outlet CircuitsWiring 3-Wire and 4-Wire Electric RangeWiring 3-Wire and 4-Wire Dryer Cord and Dryer OutletHow to Troubleshoot and Repair Electrical WiringWiring Methods for Upgrading Electrical WiringElectrical Codes for Home Electrical Wiring....and much more.» Click here to learn more about Home Electrical Wiring«

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Electrical Wiring and Electrical Repairs

Unless otherwise posted, please refer to the following Guidelines for Electrical Projects:
Skill Level:
Intermediate to Advanced - Electrical Repairs and Circuit Wiring is Best Performed by a Certified Electrician or Licensed Electrical Contractor.Find An Electrician
Electrical Tools Required:
Basic Electricians Pouch of Hand Tools, a Voltage Tester and a Multi Meter.
Estimated Time:
Depends on personal level experience, ability to work with tools, work with electrical wiring, and the available access to the project area.
Precaution:
Identify the project circuit, turn it OFF and Tag it with a Note before working with the wiring.
Important:
Modifying existing electrical circuits or installing additional electrical wiring should be done according to local and National Electrical Codes, with a permit and be inspected.

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